Shigella
Bacillary dysentery
Shigella dysentery is species of rod shaped bacterial genus shigella.
Shigella species cause shigellosis (bacillary dysentery).
It is gram negative bacilli.
Shigellosis is an intestinal tract disease.
Main sign of shigella infection is diarrhea.
Morphology
Thess are gram negative bacilli.
Non spore forming, non motile, non capsulated bacilli.
Size; 0.4 X 0.6 micrometre in size.
Characteristics
These are aerobes or facultatively anaerobic.
Can grow on ordinary media at temperature of 37 degree celcius and PH 7.4
Shigella toxin produce bacillary dysentery.
Sources and Mode of Transmission
Spread from person to person with contaminated stool serving as a major source of organisms.
Flies transmit the disease.
Contaminated food and water.
Transmitted in crowding condition with poor sanitation.
Pathogenesis and clinical significance (disease)
1. Unwashed hands
2. Gastrointestinal
3. Contamination water infected with disease
4. Contaminated food
5. Spread pathogens; diarrhoea with blood, mucus
6. Painful abdominal cramping
7. Due to contamination; Inflammation colon, rectal bleeding
8. High Fever
Lab Diagnosis
Specimen collection
Stool sample
Microscopic examination
Show pus or blood tinged mucus
Culture and cultural characteristics
Aerobic as well as facultative anaerobes
Gram staining
Show gram -ve, non motile, non capsulated bacilli.
Biochemical reaction
Treatment and prevention
Antibiotic ciprofloxacin or Azithromycin are quite effective.
It can be prevented of water, food supply and personal hygiene.
0 Comments